单项选择题

I know a number of occasions ______ people died from water pollution.

A．how
B．as
C．when
D．where
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单项选择题
Parking is a big problem, ______.
A．the traffic is so
B．is so the traffic
C．so the traffic is
D．so is the traffic
单项选择题
Nobody can be set in motion without a force ______ on it.
A．act
B．to act
C．acting
D．acted
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